Feeding mechanism for stitching machines



Feb. 22 1927.

- J. A. JACOBSEN FEEDING MECHANISM FOR STITCHING MACHINES Filed June so. 1925 4 Sheets-Sheet 1 Feb. 22, 1927.

' J. A. JACOBSEN FEEDING MECHANISM FOR STITCHING mamas Filed June30, 1925 t Sheets-:Sheet 2 2 1927 J. A. JACOBSEN FEEDING MECHANISM FOR STITCHING MACHINES Filed June so; 1925 4 Sheets-Sheet s Feb. 22, 1927.

- J; A. JACOBSEN FEEDING MECHANISM FOR STITCHING MACHINES 4 Sheets-Sheet 4 Filed June30. 1925 Patented Feb. 22,1921:

eer e srarss JAMESA. JACOBSEZN, on swe ts, NEWVYOR-VK,

FEEDING MECHANISM FOR STITCHING MACHINES.

Applieationfiled June so, 1925.. Serial No. 40,640.v

This invention relates to a feeding mechanism for Wll'Q stitching machines whereby the pamphlets, books or similar articles are automatlcally fed forwardly one step at a time. for the purpose of properly presenting the article to the stitching mechanism and permitting the latter. to apply wire stitches in uniformly spaced places thereto.

Itis the object of this invention to provide a feeding mechanism of this character which will automatically start the wire stitcher and only perform its stitching operations when a book, pamphlet or similar article is in position to receive. stitches, and when no further books, pamphlets or other articles are presented to the stitching mechanism the operation of'the latter will be antoniatically arrested." lVith this end in view tion the stop or trip working place this machine consists generally of means which is adapted to ward movement of the book, pamphlet or the like as different parts of the same are presented to the stitching mechanism and which is operatively associated with" the clutch of thestitching mechanism so as to mechanism that I and applying the next stitch in the properly spaced relation on the book blank without,

however, interfering with the forward feed Of-the latter; and also to combine this an tomatic feeding mechani'sm with the parts of the stitching'machine proper but when the machine is once started the same will continue in operation so long asboolrs, pamphlets or the like are fed to the same but will automatically cease to operate when such feeding is discontinued. V

in the arcompanying drawings Figure 1 is conventional front elevation of a wire stitching or stapling machine equipped with my improved. automatic feedin g mechanism.

Figure 2 s a sideelevation of the same. Figure 3.1sa topplan view thereof.

Figure fl; is a fragmentary front eleva' mechanismbe actuated by the forwith this invention;

tion, partly in section of the machine show- A isissai PATIENT OFFICE."

ing the parts ina positiondifierent from that indicated in Fig. 1. v

Figure 5 is a similar view showing the parts in still another position.

Figure 6 is 6-6, Fig. 1 showing the book on the saddleshaped feed, table and between the upper;

and lower rolls or: wheels "of the feeding Figure 7 is a vertical section taken on line Figure .8 isa horizontal section taken on l111B.88,.F1. 5.v

- This auto'inaticfeeding mechanism is ap-' plicable to various klnds of wire stitching and stapling machines and the one shown, to be taken, merely as a conventlonal form whichs in the drawings is, therefore,

typical of one suitable for use in connection same consists essentially of a main frame 10 provided with alower, forwardly PIOJGCtingarm ll'and an upper forwardly PlOjBCt-f a vertical section taken on line 'As there shown the ing'arm 12, a horizontal and longitudinally extendin feed table 13 mounted u on the front end of the lower armiand in this iii-- stance constructed in the form of" a saddle wh ch is substantially A-shape in cross section, a staple forming mechanism mounted on the front end of the arm 12 and represented generally by the numeral 14, a staple clinching mechanism 15 arranged atthe summit of the table 13 immediately below the staple forming mechanism 1% and supported upon the arm I shaft 16 for the machine in the upper part of the main frame, a continuously rotatingdriving pulley 17 which receives its power from any suitable source, a clutch 18 adapt ed to connect and disconnect the driving pulley 17 with the driving shaft 16, a manually operated treadle 19 pivoted on the lower part of the main frame and connected by means of a rod 20 with the clutch control ling mechanism 21 at the upper end thereof so that upon depressing the lever 19 the clutch will be coupled and the stitcher will be operated while upon raising this lever this clutch will be uncoupled and the stitching will stop, and a spring 22 for yieldingly holding the clutch operating lever 19 in its elevated inoperative. position.

The operator places an-A-shaped blank 23, such as a booklet, pamphlet or similar article astride of the front end of the feed tableor 11, aimain driving saddle 1? and pushes the same forwardly into operative relation to the means which antomat rally propel this blank into the proper posit-ion between the r staple forming and clinching mechanism pire iarinory to applying wire stitches or staples thereto. This feeding mechanism is arranged to operate upon the blanks immediately in advance of the wire staple former and clincher let and and in the preferred construction shown in the drawings, this feeding mechanism is constructed as follows:-- y

"The numerals 2%, 24:, represent two lower conical feed rolls or wheels which turn about a horizontal transverse axis relative to the saddle and each of which projects with the upper part of its periphery through an opening 25 in one of the wings of the saddle-- shaped table so that the uppermost part, of the periphery of this wheel is in line with or slightly above the surface of this part of the saddle. The angle of the conical face of each of these lower feed rolls is preferably the same as the angle of the respective side or wing of the feed table and in its periphery each of these lower feed, rollers is provided with an annular groove 26. These two feed rollers'are mounted on a transverse shaft 27 whichis journaled at its opposite endsin suitable bearings 28 on the adjacent partof the table or saddle and is turned so that the upper sides of the lower feed rollers more forwardly or toward the stitching mechanism. The driving means for this purpose, shown in the drawings, as an example. consists of a lower driven shaft 29 journalediin bearings 30 on the main frame, an upper driving shaft 31 journaled in bearings 32, 33 on the main frame, abelt 3-1 passing around pulleys 35, 36 secured respectively to the main driving pulley 17 on the shaft 3] a belt 37 passing around pulleys 38 and39 cured respectively to theshatts 31 and 29 and a belt 40 passing around pulleys 4L1, secured respectively to the shafts Q!) and 27. Above each of the o ieningr 95 is arranged an upper feed roller Wheel 4-3 which has its axis arranged transversely and parallel with the upper side of the respective wing of the feed table and has its lower part arrangrul opposite with the upper part of the groove 26 in the companion lower feed roller and slightly below the peripheral portions of th s lower roller on opposite sides of the groove thereof so that when a hook blank 23 is passed between each pair ol. these rollers a slight deflection will be produced in this bool: blank by reason of the three point contact of the upper and lower pair of rollers therewith, as shown in Fig, 6 whereby these rolls obtain a firm grip on the blank and insure a positive forward feed of the same over the tableor saddle and pass the stitchine mechanism which forms and applies the wire staple or stitches thereto, Each of the up per feeding rolls or wheels is turned so that its lower face moves toward the stitching mechanism and advances the booklet in that direction. For this purpose these upper feed rolls are mounted and driven by means which in their preferred form are constructed as follows The numeral represents a depending bracket mounted on the front end of the upper frame arm 12 and provided at its lower part with bearings H, 4:7 in two downwardly d iverging roller shafts 48, 419 which carry the rollers 4 at their lower ends. These upper rollers are caused to rotate in unison by i-ntermeshing' bevel goal-s50, 51 secured to the upper ends of their shafts 18, 49, as best shown in Fig. 2. Motion is transmitted to the gears olfrom the upper driving shaft 31 by an intermediate shaft having upper andlower sections 52, which are arranged at an angle relatively to each other and operatively connected by means of a universal coupling 44-, the upper shaft section 52 being journaled in a bearing 54 and the lower shaft section 53 ina bearinghfj, a pair of (xi-operating spiral gears 56,' 57 secured. respectively to the shaft 31 and the upper intermediate shaft section li and a beveled gear wheel 58 secured to the lower intermediate shaft section 53 and meshing with the beveled e ear wheel 51; The driving mechanism of the upper and lower rolls is so timed that the peripheral speed of these feed rolls is the same thereby avoiding dragging on the pamphlets which are being stitched and insuring proper feeding of the same lengthwise over thesaddle past the stitching mechanism.

By constructing each of the lower feed rollsin conical forn'ithat part of the peripheral gripping face of cachet the lower feed rolls having larger diameter will travel some what faster than that part of the conical face of each of these rolls which has a smaller diameter, thereby causing these lower feed rolls to produce a downward drawing e'l'lect upon the two wings or leaves of each blank on opposite sides of the summit oi the saddle whereby the blank is drawn tightly downwardly against the saddle and the proper placing of the stitch or staple on the. same is assured for the inn-pose of producin uniform and high grade work.

The driving mechanism which operates the feed rollers operates continuously so long; asthe i'nacliine is in use but the stitcliingr inm-baniinn only opcratiai when a, boolclcl, pan'iphlct or other blank is in position law tween the staple forming and (lllllfilllllll' mechanism. after the machine has been started to effect its first stitching operation. and the blank has been sncceaively advanced step by step for bringing diflerent parts of the blank in spaced relation to the stitching mechanism, but after the feeding of the blan s to the stitching mechanismhas been discontinued the operation of the machine will beautomatically arrested;

The preferred form of the means whereby this is accomplished is constructed as folv starting the machine. This trip rod 59 is yieldingly held in its elevated position by means of a spring 60 interposed between a suitable shoulder on themain frame and a collar 61 on the shipper rod 59, as best shown in Fig. 2. The i'iumeral 62 represents a retary disk winch 1s mounted loosely on'the shaft'31 in rear of the stitching mechanism 4' and provided on its periphery with atrip cam 63'which upon engaging a roller 9 at the upper end of the trip rod 59 will depress the latter and start the operation of A the stitching machine. Adjacent to the front Q tive position untilthe front end 70 of a shiftside of the trip wheel or disk '62 a'ratchet driving wheel 64 is secured to the continuously rotating shaft 31 so as to turn in unison therewith. On the front side of the trip disk 62 is mounted a coupling dog or v A) N a J: '11 n panl 6), the nose 6 orwnicn 1s aoapted to engage with one or another of' the teeth of the ratchet wheel 64 and thereby couple the trip'disk 62 with the driving shaft 31. The dog 65 is yieldingly held in a position in which it engages its nose or beak 66 with this ratchet wheel by means of a spring 67 terposed between a shoulder 68 on thetrip disk 62 and'a tail 69 on thedog 65,]as shown m Fig. 5. This dog remains in this operaing bar 71 is arranged in the path of the tail 69 and causes the coupling dog 65to berdisengaged from theratchet wheel 64, as shown by dotted lines in Fig. 1, thereby disconnecting the tripdisk 62'from the driving shaft 31: The shiftin bar 71 is arran ed len th- V V h D {2 wise and horizontally above the rear partof the feed table or saddle as shown 1n Figs. 1, '-r ni 0, l, o, 6 and t, and 15 mounted on tic mam frame of themachme so that the same is capable of horlzontal, longitudinalas well as vertical motion relatively to the table or saddle. A forward longitudinal movement of 'the'shifting bar 71 for disengagingfthe tappet 70 atits front end from the tail 69 of the coupling dog is effected by engagement of the front end of the blank tobe stitched with a stop 72 of which one or more may be mounted-in a longitudinal row and in spaced relation relatively to each other on the shifting bar 71 in accordance with the number of stitches which are to be applied to the blanks and the relative spacing between i adjacent stitches. As shown in Fig-Lthre'e of vsuch stops are mounted onthe shifting bar 71 and lie the the same are equally spaced relatively to each other. Upon presenting the first booklet, pamphlet or similar blank or article to the feed rolls the latter will advance'this blank until the front-edge of the same strikes thelirst stop 72 and moves the latter together with the shlfting bar F1 sufficiently forward to move the tappet 70 out of the path of the tail 69. WVhen this occurs the spring 67 immediately throws the dog 65 into engagement with the ratchet wheel 64 so that the trip disk 62 will be. compelled to turn with the shaft 81, the timing of the parts being such that whenthis coupling is effected the cam 63 is immediately in front of the roller 9 of v the trip rod 59 so that the first effect of the rotary movement of this trip disk 62 is to depress the 'trip rod '59 together with the treadle and cause the clutch 15 tobe operated for coupling the stitching mechanism with the driving pulley17 whereby a wire stitcher or staple will be applied to that part ofthe book or pamphlet which at the time is arranged between the staple forming and clinching mechanism. Immediately after a stitch has been thus applied to the pamphlet he "ft the stop 72 which has-been engaged by front edge of the book blankout of the p 2th of the latter and will then lower this shifting bar7l so as to position the parts for again causing an automatic operation of the stitching mechanism when the book or pamphlet blank has reached the proper position between the staple or stitch forming and linching mechanism for receiving the next stitch or staple. q f

For this purpose a shifting bar 71 is nounted on the main frame so as to becapable ofa longitudinally reciprocating and a vertically oscillating movementby means of a pluralityof elbow levers which are pivoted at 78 on a supporting bar 74 forming part of shifting bar-71 is raised sothat it will the mainframe and each elbow lever having a horizontal arm 75 which is connected by means of a vertical link '26 with the shifting bar 71, and a longitudinally reciprocating lifting ar 77 connected with the lower arms 78 of the elbow levers and provided at its front-end with 'aroller 79 adapted to'be engaged by the cam .63 of the trip disk. The shifting bar 71 and the parts associated therewith tend to move automatically by gravity into their initial position, butthis movement is aided by means of a spring 80 which connects one of the links 76 with an arm 81 on the adjacent part of the main frame so that this spring tends constantly to move the two bars 791 and 77 forwardly or toward the disks 62', the movement of these parts in this direction being however, limited by means of a stop 82 mounted on the frame bar 74 and adapted in the present in- 76, as shown in Fig. 1.

By means of this construction the cam (53 innnediately ail'ter depressing the clutch shipper rod I!) for starting the stitching mechanism then engages the roller 79 of the lifting rod 77 and pushes the latter forwardly thereby causing the elbow levers to be turned in the direction for lifting the shifting rod 71 and raising the respective stop 72 which has been engaged by the front edge of the blank out of the path of the latter and thereby permitting this blank to continue in its forward Inovei'nent, as shown in F ig. 5, under the action of the feed rolls. The cam (53, however, imn'iediat-ely clears the lifting rod 79 after effecting this lifting operation as to permit the shifting bar 79 to again descend and bring the next fol. lowing stop '72 into the path of the blank at the summit of the saddle. As soon, therefore. as the blank has been again advanciul by the feed rolls and engaged with the next il'ollowing stop 72 the latter will be again moved tlorwardly suil'iciently to disengage the tappet of the shifting bar out of engagement from the tail 69 of: the dog (35, as shown in Fig. el, when the OPOI'Rt-itlfl of tripping the main clutch 18, and operating the stitching mechanism, and lifting the respective stop 72 out of the path oi the blank is repeated, this auton'iatic operation of the stitching mechanism in this manner recurring as often and at such intervals as may be desired depending on the number of stops 72 which are mounted on the shifting bar 71. and the relative spacing of the same. In order to permit each of the stops 72 after being once lifted to clear the pamphlet which it has arrested to again descend and to be ready for another operation without interfering with the descent of succeeding stops which are about to be engaged by the front edge oi? the blank, each of the stops 72 is mounted on the shifting bar 71 so that it capable of engaging yieldingly with the top of the blank which is being stitched. This yielding connection preferably consists of a carrier mounted on the shifting bar 71 and provided with a vertical slot 8 1: and also provided on its front side with a vertical guide face which is engaged by the vertical rear side 86 of the respective stop 72, two guide lugs 87 projecting forwardly from the upper part of the stop 72 on opposite sides of a carrier 83 and a guide pin 88 passing through the slot Hi. and connected at its opposite ends with the lugs 87. as bet-4t shown in Figs. 1, 4,, and 8. By this means the stop 72 may be lowered into its operative position close to the summit ot' the saddle so that it will stand. in the path ol': the :ulvancing blank, as shown in Fig. T,

and the same is also capable of yielding by sliding upwardly on its carrier 82 when on gaging the top of the blank upon being lowered while over the latter, as shown 1n Figs.

Jrctlerablv forked or of? bifurcated form as shown in Figs. (3 and 7 sotlnit it will straddie the saddle and positively arrest the blank which is being fed against the same.

For the purpose of enabling the stops "2 to be adjusted in a ditl'ercnt position lengthwise of the shifting bar 71 to suit the desired spacing oil? the stitches which are to he applied to the pamphlet, each of the carriers 83 is slidably mounted with its upper part on the shifting bar 71 by providing the same with upper and lower hooks 89 and 90 which in'ipress the uppe and lower edge of the shifting bar Tlaud holding this carrier in position after adjustmmit by means of a clamping screw 91 arranged on this carrier and adapted to engage with the side of the shifting bar 7]., as shown in Figs. 6 and 7.

llhen the stitched blank reaches the discharge end of the table or saddle 13 the same is niisitively ejected therefrom by passing between an upper roller 92 which is supported at the lower end of abar 93 forming part oi the main tranie and the delivery end oi a discharge belt 9* which passes around which it receives its motion.

In practice the operator feeds each new unstitched blank close behind the previous blank which is being operated upon by the machine so that in eii'ect a continuous stream oi blanks or booklets are being propelled thronghthe machine and stitches applied thereto at predetermined intervals. Under these circumstances the operation of applying stitches to the blank is effected automatically as well the propulsion o:i' the blank through the machine and no further attention is required on the part of the operator other than to keep supplying the machine with blanks in a continuous stream. If, however, an interruption occurs in the feeding of the blanks then the operation of the stitching mechanism will be automatically arrested when the last stitch has been applied to the blank fed to the machine.

I claim as my invention 1. A feeding mechanism for wire stitching machines, eon'iprising a supportupon which the article to be stitched is adapted to rest and which is provided with an opening, and feed wheels adapted to engage opposite sides of said article in line with said opening, one of said wheels being provided with a peripheral groove and the other wheel having a. peripheral part adapted to deflect said article into said groove. p a I 2. A feeding mechanism for a wire stitchan inclined side provided with an opening, a lower conical feed wheel turning about :1

mg machine, comprisinga teed table having ra s-591 horizontal transverse axis and having its upper part pro ec tmg upwardly into said opening and provided with a perpiheral groove,

and an upper cylindrical feed wheel'having its'axis inclined and parallel with the upper side of said support and arranged above said opening and adapted to deflect-a part of said article downwardly into said groove.

3. A feeding mechanism for wire stitching machines, comprising a saddle shaped sup port upon which the article to be stitched is adapted to rest and which is provided'on opposite sides of its summit with openings,

pairs of co-operating feed wheels each pair having a lower conical wheel arranged below one of'said openings and provided with a peripheral groove and an upper wheel ar ranged above the respective opening and adapted to press part of the article tobe stitched into said groove, and means for rotating said wheels.

4. A feeding mechanism for wire stitching machines, comprising a saddleeshaped support upon which the article. to be stitched is adapted torest and which is provided on opposite sides of its summit'with openings,

pairsof' co-operating feed wheels each pair having a'lower conical wheel arranged below one of said open ngs andprovlded with a peripheral groove and an upper whee-l ar-- ranged above the respective opening and adapted to press part of the article to be stitched into said groove, and means for rotatmg sald upper wheels, comprising an upper driving shaft, driven shafts connected I with said upper feed wheels, 'intermeshing bevel gear wheels connected with said driven shafts, upper. and lower intermediate shaft sections which are arranged at an angle rela- 't1vely' to each other, mtermeshmg-gea'rs secured to said driving shaft and-said upper intermediate shaft section, a universal joint connectingsaid intermediate shaft sections, and a bevel gear wheel arranged on the lower intermediate shaft section and meshing with one of said driven bevel gear wheels.

5. A fee'dmechanism for wire stitching machines, comprising a clutch'for connecting with and disconnecting the stitching mechanism from a power source, a feed table, means for propelling the articles to be stitched lengthwise over said table, a stop adapted to be engaged by the article to be stitched, and to be moved thereby, and

means for. controlling said clutch by motion imparted to said stop by said article, comprising a driving shaft which rotates continuously, a ratchet wheel rotating with said shaft, a disk rotatable and concentric with said shaft, a coupling dog movably mounted on said disk and adapted to be engaged with V and disengaged from said ratchet wheel, and

a shifting bar carrying said stop and capableof moving lengthwise and also vertically toward and from said table and adapt ed to move into and out of the path Of said dog for disengaging the same from said ratchet wheel and permitting the same to engage therewith. 6. A feed ineclianisnifor wire stitching machines, comprisinga clutch for connecting with and disconnecting the stitching mechanism from a power source, a feed table, means for propelling the articles to be stitched lengthwise over-said table, a stop adapted to be engaged by the article-to be stitched, and to 'bemoved thereby, and

means for controlling said clutch by motion imparted to said stop by said article, comprising a driving shaft which rotates con tinuously, a ratchetwheel rotating with said shaft, a disk-rotatable and concentric with said shaft, a coupling dog'fmov'ably mounted on -saiddisk and adapted to be engaged with and disengaged from a said ratchet wheel, a shifting bar carrying said stopand capable of moving lengthwise and also verticallytoward and from said table and adapted to; mover-into and outof the path of said dog for disengaging thes'ame from said ratchet wheel and permitting the same to engage therewith, elbow levers each having one arm connected with said shiftlng bar, a lifting barconnectmg 'the other (arms of said elbow levers, and" a cam arfor controlling said clutchby motion imparted to said stop by said article, compris- "ing a driving shaft 'whic'h rotates continuously, a ratchet wheel rotatingwith said shaft, a disk rotatable and concent'ric with saidshaft, a coupling dog movably mounted on said disk and'adapted to be engaged with and disengaged from said ratchet wheel, a shifting bar carrying said stop and -capa-ble of moving lengthwise and also vertically toward and from said table and adapted to -move into and out of the path of said dog for disengaging the same from said ratchet wheel and permitting the same to engage therewith, elbow levers each having one arm connected with said shifting bar, a lifting .barconnecting the other arms of said elbow levers, a cam arranged on said disk and adapted to move said llftmg bar lengthwise,

and atrip rod' which is operatively associated withsaid clutch and which is adapted to be shifted by said cam;

8. A feed mechanism for wire stitching machines, comprising a driving clutch for connecting with and disconnecting the stitching mechanism from the source ct a carrier mounted on said bar and provided power, a feed table over which the articles to he stitched are moved, means forcontrollin said stitchin" and feeding mechanism including a shifting har movahle lengthwise of the table andalso vertically toward and from the same, a stop adapted to he arranged in the path of the articles to he stitched and to be shifted thereby, and means for holding said stop against forward move ment on said bar but permitting the same to move vertically thereon.

9. A feed n'iechanism for wire stitching machines, (-ommising a driving clutch for connecting with and disconnecting the stitching mechanism from the source of power, a feed table over which the articles to he stitched are IIIOVQCLJIICHHS for controlling said stitching and feeding mechanism, including a shifting bar movable lengthwise of the table and also vertically toward and from the same, a stop adapted to he arranged in the path of the articles to he stitched and to 1 be shifted thereby, and

means for holding said stop against forwar l movement on said bar but permitting the same to move vertically thereon, compi with a vertical slot, andhaving a vertical guide face which is engaged by said step, and a pair of lugs arranged on opposite sides of said carrier and connected by a pin passing through said slot.

10. A feed mechanisnrfor wire stitching machines, comprising aclutch for C0nnccting with. the disconnecting the stitching mechanism from a power source, a food table, means for propelling the articlesto he stitched lengthwise over said table, a stop adapted to be engaged by the article to he stitched and to be moved thereby, and means for controlling said clutch by motion imparted to said stop by said articles,compria ing a driving shaft which rotates rontinnously, a ratchet wheel rotating with said shaft, :1. disk rotatable and concentric with said shaft, a coupling dogmovahlymoonted on said disk and adapted to he engaged avith and disengaged from said ratchet w reel, a shifting har carrying said step and capable of moving lengthwise and also verinn with and discoimecting the stitching mechanism from a pmvcr source, a feed tahlc, means for propelling the articles to he stitched lengthwise over said tahle. a stop ipted to he engaged by the article to he L means for coi'itrolling said clutch by motion imparted to said stop hy said article, comprising a driving shaft which rotates continuously. a ratchet wheel rotating with said shaft, a disk rotatable and concentric with said shaft, a coupling do;- movably mounted on said disk and adaptedto he engaged with and disengaged ironrsanl ratchet wheel, a

shifting bar car-l ving said stop and capable of moving lengthwise and also vertically toward and from said table and adapted to move into and outot' the path of said dog for disengaging the same from said ratchet wheel and permitting the same to engage therewith, elbow levers pivoted on fixed supports, links each connectingone arm of each elbow leverwith said shifting bar, a lifting bar connected with the other arms at said elbow levers, a carnal-ranged on said disk ;titchcd, and to he moved thereby, and

and adapted to engage said liftingharand move the same in the direction for raising the shifting bar and stop, a spring for moving said shitting bar and associated parts in the opposite directiijm,and a stop tor limiting the movement of said shitting bar and associated parls ondi-ar the action of saidspring.

y i JAMES a. Jaoonseir. 

